Improvement in methods of repairing structures with beton or concrete



c. GOODR-IDGE, Ir. METHOD OF REPAIRING STRUCTURES WITH vBE'ION 0RCONCRETE.

No 193,865, Patented'Aug. 7,1877.

In wanton- UNITED STATES PATENT OFFIoE.

JOHN (J. GOODRIDGE, JR, OF NEW YORK, N. Y.

IMPROVEMENT IN METHODS OF REPAIRING STRUCTURES WITH BETON 0R CONCRETE.

Specification forming part of Letters Patent No. 193.865, dated August7, 1877; application filed March 21, 1877.

To all whom it may concern:

Be it known that I, JOHN (J. GOODRIDGE, Jr., of the city of New York,and State of New York, have invented a new and useful Method ofRepairing Structures with Beton or Con crete; and I hereby declare thatthe following is a full and exact description thereof, reference beingmade to the plate which accompanies and. forms part of thisspecification.

This invention relates to the repairing,

' strengthening, replacing, protection, and preservation of structuresformed wholly or in part of stone, brick, metal, or of rock, in itsnatural position by the employment of beton or concrete. Repairs maybecome necessary from imperfect construction, disintegration, oxidation,friction, pressure, or concussion.

The material to which the beton is to be applied should first becarefully cleaned, the joints thoroughly raked out, and all loosefragments removed. It should then be washed with a mixture of lime andwater and a small quantity of cement. This assists the beton in forminga bond. Care should be -taken that no unslaked lime gets into the work.Molds of wood or metal, or a wall of masonry, is then placed, and firmlyfastened and braced, at a distance from the old structure or material,decided upon as the proper thickness of the beton. The mold is thenfilled with beton, layer by layer, and thoroughly rammed and forced intoall joints, crevices, irregularities, and inequalities of surface. Thisprocess is continued until the beton is carried as high as necessary.After the beton has set, which will be in from two to ten days, themolds may be removed.

Figure 1 shows a retaining-wall, A, thrust out of alignment by the bankB. The beton mass 0 is joined to the wall A in the manner described, andA and 0 form a wall which is stable, and capable of supporting thethrust ofthe bank. Fig.2 shows an arch,A, strengthened by the betonlining B. A mold is placedin the arch, and at a proper distance from it.The space between the arch and mold is then carefully filled with beton.This attaches itself to the arch and fills all joints andirregularities, so that water cannot get between it and the oldstructure. A new structure may be made by first placing a lining ofbeton and then placing the stone or other material upon that. When thetop of an arch to be repaired is accessible it may be uncovered, all oldfill ing removed, and the beton placed upon the old structure, using itas a mold. Fig. 3 shows the method of replacing a foundation, A beingthe tower-wall or pier, (.l the foundation which is to be replaced, andD afirm soil or rock below, to which it is desirable to transfer theWeight. Should the old foundation 0 be very uncertain, the buttress Bshould first be made of beton. Section 1 of 0 is then removed andreplaced with beton; next, section 3, and so alternately. Then return to2 and 4; or they may be taken in regular order if time is allowedbetween each replacement for the beton to harden. In this manner anystructure or its foundation may be replaced, section by section. Thebeton, completely filling the space occupied by the material removed,prevents any settling, and allows the structure to be used for thepurposes for which it was constructed during the time occupied by itsrepair. If the surface of a structure is deteriorating, or not strongenough, from any cause, or if water, getting inside, separates itscomponent parts, ashappens particularly in river piers and abutments, itmay be entirely incased in beton and its whole surface covered.

1 do not claim as new the building of new structures entirely of betonor concrete, or the backing ,of new structures having a stone face, orof plastering of masonry by means of trowels and floats, as is done inmastic work.

What I claim, and desire to secure by Lettess Patent, is-

The withindescribed method of repairing and replacing structures formedwholly or in part of stone, brick, or metal, or rock in its naturalposition, by the employment of beton or concrete, substantially in themanner set forth.

JOHN C. GOODRIDGE, JR. Witnesses:

GEO. G. SooFIELD, HOWARD EARLE.

